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Hogar » Productos » Industria » 1*16 POM Pin-point Gate S136R HRC48-52 Steel Mascara And Nail Polish Brush Rod Assembly Custom Plastic Mold

1*16 POM Pin-point Gate S136R HRC48-52 Steel Mascara And Nail Polish Brush Rod Assembly Custom Plastic Mold

This is a high-efficiency, high-precision 1×16 multi-cavity injection mold, custom-built for mass production of POM (Polyoxymethylene) brush rod assemblies used in mascara, nail polish, and cosmetic applicator packaging. Featuring a pin-point gate runner system, premium S136R corrosion-resistant stainless steel (heat-treated to HRC48–52), this mold is engineered for ultra-high volume, clean, and consistent production of slender, high-tolerance cosmetic components. It is optimized to meet the strict hygiene, dimensional accuracy, and surface quality requirements of the beauty industry.
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  • 23323

  • YIXUN mold

  • 8480419090

This is a high-efficiency, high-precision 1×16 multi-cavity injection mold, custom-built for mass production of POM (Polyoxymethylene) brush rod assemblies used in mascara, nail polish, and cosmetic applicator packaging. Featuring a pin-point gate runner system, premium S136R corrosion-resistant stainless steel (heat-treated to HRC48–52), this mold is engineered for ultra-high volume, clean, and consistent production of slender, high-tolerance cosmetic components. It is optimized to meet the strict hygiene, dimensional accuracy, and surface quality requirements of the beauty industry.

Mold Technical Specifications

Parameter Specification
Mold Configuration 1×16 multi-cavity balanced layout
Runner System Pin-point gate injection for clean, automatic degating
Molding Material POM (Polyoxymethylene / Acetal)
Cavity & Core Steel S136R corrosion-resistant stainless steel
Hardness HRC 48–52 (vacuum heat-treated)
Application Mascara and nail polish brush rod assemblies, cosmetic applicator components
Key Features High productivity, precise concentricity, smooth demolding, corrosion-resistant
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Key Design & Performance Advantages

1. 1×16 Multi-Cavity Layout for Mass Production

The 16-cavity symmetrical design maximizes output for high-volume cosmetic packaging production:
  • Uniform flow & cooling: Balanced runner paths ensure identical melt delivery and thermal control for all 16 parts, eliminating dimensional variation between cavities.

  • High efficiency: Produces 16 complete brush rod assemblies per cycle, drastically reducing unit cost and cycle times.

  • Precision concentricity: The symmetrical layout minimizes part-to-part variation, critical for ensuring the slender rod and cup base are perfectly aligned for consistent brush fit and performance.

2. Pin-Point Gate Runner System for Clean, Low-Waste Production

The pin-point gate design is purpose-built for cosmetic applicator parts:
  • Minimal gate vestige: Creates a tiny, almost invisible mark on the part surface, eliminating the need for secondary trimming or finishing.

  • Automatic degating: Parts separate cleanly from the runner during ejection, supporting fully automated, hands-free production.

  • Reduced material waste: Small gate design minimizes scrap and prevents over-packing, ensuring consistent part weight and rod straightness.

3. S136R Stainless Steel: Corrosion Resistance & Durability for Cosmetic Molding

S136R is the ideal steel for molds requiring hygiene, corrosion resistance, and long service life:
  • Superior corrosion resistance: Prevents rust, staining, or pitting from moisture, additives, or cosmetic formulations, ensuring clean, uncontaminated parts.

  • High polishability: Accepts fine polishing, delivering smooth, defect-free surfaces on both the slender rod and cup base, preventing sticking or scratching during demolding.

  • Long service life: Heat-treated to HRC48–52, the mold withstands millions of high-pressure POM injection cycles while maintaining dimensional stability.

4. POM Material Optimization for Brush Rod Applications

POM is the preferred material for cosmetic applicator rods due to its stiffness, low friction, and dimensional stability. This mold is optimized to address its unique molding challenges:
  • Rod straightness control: Precision cooling and balanced filling prevent warpage or bending in the long, slender rod section.

  • Cup base integrity: Optimized venting and gate placement eliminate sink marks or voids in the threaded or ribbed base, ensuring a secure fit with cosmetic bottle necks.

  • Low-friction demolding: Polished mold surfaces reduce ejection force, preventing deformation or scratching of the delicate rod.

5. Precision & Hygiene for Cosmetic Packaging

This mold meets the strict quality standards of the beauty industry:
  • Tight tolerances: Critical features like rod diameter, cup inner dimensions, and thread profiles are held to strict tolerances for perfect assembly with cosmetic bottles and brushes.

  • Hygienic production: The corrosion-resistant S136R steel and clean hot/cold runner design prevent contamination, suitable for contact with cosmetic products.

  • Consistent quality: Every shot produces identical parts, ensuring reliable performance in mascara and nail polish applicators.


Typical Applications

This mold is specifically designed for manufacturing cosmetic applicator components, including:
  • Mascara brush rod assemblies

  • Nail polish applicator sticks

  • Lip gloss and lip brush handles

  • Liquid eyeliner and brow product applicator bases

  • Precision cosmetic packaging components


Conclusion

The 1×16 cavity POM pin-point gate injection mold is a high-performance solution for mass-producing precision cosmetic brush rod assemblies. With its high-efficiency 16-cavity design, durable S136R steel construction, and POM-specific optimization, it delivers consistent, hygienic, and cost-effective production of critical beauty packaging components.


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